diff --git a/src/main/java/de/neemann/digital/gui/components/terminal/Keyboard.java b/src/main/java/de/neemann/digital/gui/components/terminal/Keyboard.java
index 06af43c79..1d6084a77 100644
--- a/src/main/java/de/neemann/digital/gui/components/terminal/Keyboard.java
+++ b/src/main/java/de/neemann/digital/gui/components/terminal/Keyboard.java
@@ -71,7 +71,7 @@ public class Keyboard extends Node implements Element {
         enableVal = enable.getBool();
         boolean nowClock = clock.getBool();
 
-        if (keyboardInterface != null && !nowClock && lastClock && enableVal)
+        if (keyboardInterface != null && nowClock && !lastClock && enableVal)
             keyboardInterface.deleteFirstChar();
 
         lastClock = nowClock;